计算:5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
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5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
=5a^2-a^2-(5a^2-2a)+2(a^2-3a)
=4a^2-5a^2+2a+2a^2-6a
=a^2-4a
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